30407881 has 6 divisors (see below), whose sum is σ = 35372490. Its totient is φ = 26063856.

The previous prime is 30407879. The next prime is 30407887. The reversal of 30407881 is 18870403.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28676025 + 1731856 = 5355^2 + 1316^2 .

It is not a de Polignac number, because 30407881 - 2¹ = 30407879 is a prime.

It is a super-2 number, since 2×30407881² = 1849278453820322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30407887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 310236 + ... + 310333.

It is an arithmetic number, because the mean of its divisors is an integer number (5895415).

Almost surely, 2^30407881 is an apocalyptic number.

It is an amenable number.

30407881 is a deficient number, since it is larger than the sum of its proper divisors (4964609).

30407881 is an equidigital number, since it uses as much as digits as its factorization.

30407881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620583 (or 620576 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 30407881 is about 5514.3341393136. The cubic root of 30407881 is about 312.1251176087.

The spelling of 30407881 in words is "thirty million, four hundred seven thousand, eight hundred eighty-one".